|About this Abstract
||MS&T23: Materials Science & Technology
||High Temperature Corrosion and Degradation of Structural Materials
||Development of Ablation-Resistant, High Emittance Coatings for Carbon/Carbon Composites for Hypersonic Application
||Abdullah Al Saad, Carlos Martinez, Rodney W. Trice
|On-Site Speaker (Planned)
||Abdullah Al Saad
During re-entry, the hypersonic leading edges can experience enormous heat fluxes, with surface temperatures greater than 1600℃ expected. While carbon/carbon (C/C) is a candidate material for leading edge structures, it is prone to ablation damage above 500℃. Ablation-resistant coatings can protect the C/C, while emittance can be engineered to lower the leading-edge surface temperature via radiative cooling. In this study, a novel multilayer coating system based on individual layers consisting of borides, carbides, zirconia, and rare-earth oxide as emissivity modifiers is being applied to a C/C surface via pack cementation and plasma spray. Ablation tests are performed to evaluate the efficacy of the multilayer coatings in simulated high heat flux environments. A radiometric emissometer is being developed to measure the spectral emittance of the coating surface at high temperatures up to 1500℃. The outcome of these experiments will help optimize the design of protective, high emittance coatings for C/C composites.